No, "jet stream" is not typically hyphenated when used as a compound noun.
The term "time travel" is typically not hyphenated when used as a noun or adjective. However, if it is being used as a verb, it may be hyphenated, such as in "time-traveling." The usage may vary depending on the style guide being followed, but in general, it is more common to see "time travel" as two separate words.
There are three types of compound noun; closed (bathtub), hyphenated (fifty-five), and open spaced; examples of open spaced compound nouns are:back yardblack birdbumble beebus stopfront doorhome platehot platepet shopquestion markshoe storetennis shoewindow pane
Yes, the term "free of charge" is hyphenated when used as a compound adjective before a noun. For example: "This service is free of charge."
It is a micrometer, also called micron. It is 1 millionth of a meter. I hyphenated micrometer to differentiate the unit of measure from the measuring instrument.
No it doesn't need to be hyphenated.
No it doesn't need to be hyphenated.
The noun phrase 'four week vacation' does not need to be hyphenated.
yes for clarification
No, "reassigned" does not need to be hyphenated. The prefix "re-" is commonly used with verbs and is typically not hyphenated unless it precedes a proper noun or creates confusion. Therefore, "reassigned" is correctly written as one word.
No it doesn't.
does write up need a hyphen
No it doesn't need to be hyphenated.
No the word "midday" is not hyphenated.
Yes it should be hyphenated.
Yes it should be hyphenated.
It is not hyphenated.